Langmaid joined the Royal Navy in 1910 and went to sea at the beginning of the World War I serving at the Dardanelles in HMS "Agamemnon" where he made official sketches for landings. After the war, he studied at the Royal Academy Schools and the Royal College of Art. He became a highly accomplished engraver as well as a painter in oil and watercolour with a style similar to the famous marine artist W L Wyllie with whom he collaborated in Sea Fights of the Great War, 1914-18.
Langmaid returned to the Active List in 1939 in the rank of Lieutenant Commander and served as official Admiralty artist to the Commander-in-Chief Mediterranean Fleet from 1941 to 1943. He died in Calle de la Bolsa, Malaga, Spain in 1956.
